He was very much ahead of his time. One of the greats.
From this link (a quick search), and only just some of what he’s done.
The first time Frank Miller drew Batman, it was for a Denny O’Neil story. After that, O’Neil gave Miller full control of Daredevil, the book that would make the young artist famous.
And after that, he edited The Dark Knight Returns and tapped Miller to write Batman: Year One, a crucial redefinition of the character for a new era.
He mentored Devin Grayson, still the only woman to be the lead writer on a core Batman book, and built a Batman bullpen of some of the best talent to ever grace the character’s pages.
From the pivotal post-Crisis on Infinite Earths year of 1986 through to the year 2000, O’Neil set the tone for Batman stories, editing The Killing Joke, overseeing the death of Jason Todd, the creation of new Robin Tim Drake, the rise of Bane, and the expansion of the Bat-family into a sprawling found-family soap opera.
I think the most influential on one of the greatest characters in any medium.
RIP
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